linux/arch/ia64/mm/contig.c
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   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 1998-2003 Hewlett-Packard Co
   7 *      David Mosberger-Tang <davidm@hpl.hp.com>
   8 *      Stephane Eranian <eranian@hpl.hp.com>
   9 * Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com>
  10 * Copyright (C) 1999 VA Linux Systems
  11 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
  12 * Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved.
  13 *
  14 * Routines used by ia64 machines with contiguous (or virtually contiguous)
  15 * memory.
  16 */
  17#include <linux/bootmem.h>
  18#include <linux/efi.h>
  19#include <linux/mm.h>
  20#include <linux/nmi.h>
  21#include <linux/swap.h>
  22
  23#include <asm/meminit.h>
  24#include <asm/pgalloc.h>
  25#include <asm/pgtable.h>
  26#include <asm/sections.h>
  27#include <asm/mca.h>
  28
  29#ifdef CONFIG_VIRTUAL_MEM_MAP
  30static unsigned long max_gap;
  31#endif
  32
  33/**
  34 * show_mem - give short summary of memory stats
  35 *
  36 * Shows a simple page count of reserved and used pages in the system.
  37 * For discontig machines, it does this on a per-pgdat basis.
  38 */
  39void show_mem(void)
  40{
  41        int i, total_reserved = 0;
  42        int total_shared = 0, total_cached = 0;
  43        unsigned long total_present = 0;
  44        pg_data_t *pgdat;
  45
  46        printk(KERN_INFO "Mem-info:\n");
  47        show_free_areas();
  48        printk(KERN_INFO "Node memory in pages:\n");
  49        for_each_online_pgdat(pgdat) {
  50                unsigned long present;
  51                unsigned long flags;
  52                int shared = 0, cached = 0, reserved = 0;
  53
  54                pgdat_resize_lock(pgdat, &flags);
  55                present = pgdat->node_present_pages;
  56                for(i = 0; i < pgdat->node_spanned_pages; i++) {
  57                        struct page *page;
  58                        if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
  59                                touch_nmi_watchdog();
  60                        if (pfn_valid(pgdat->node_start_pfn + i))
  61                                page = pfn_to_page(pgdat->node_start_pfn + i);
  62                        else {
  63#ifdef CONFIG_VIRTUAL_MEM_MAP
  64                                if (max_gap < LARGE_GAP)
  65                                        continue;
  66#endif
  67                                i = vmemmap_find_next_valid_pfn(pgdat->node_id,
  68                                         i) - 1;
  69                                continue;
  70                        }
  71                        if (PageReserved(page))
  72                                reserved++;
  73                        else if (PageSwapCache(page))
  74                                cached++;
  75                        else if (page_count(page))
  76                                shared += page_count(page)-1;
  77                }
  78                pgdat_resize_unlock(pgdat, &flags);
  79                total_present += present;
  80                total_reserved += reserved;
  81                total_cached += cached;
  82                total_shared += shared;
  83                printk(KERN_INFO "Node %4d:  RAM: %11ld, rsvd: %8d, "
  84                       "shrd: %10d, swpd: %10d\n", pgdat->node_id,
  85                       present, reserved, shared, cached);
  86        }
  87        printk(KERN_INFO "%ld pages of RAM\n", total_present);
  88        printk(KERN_INFO "%d reserved pages\n", total_reserved);
  89        printk(KERN_INFO "%d pages shared\n", total_shared);
  90        printk(KERN_INFO "%d pages swap cached\n", total_cached);
  91        printk(KERN_INFO "Total of %ld pages in page table cache\n",
  92               quicklist_total_size());
  93        printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages());
  94}
  95
  96
  97/* physical address where the bootmem map is located */
  98unsigned long bootmap_start;
  99
 100/**
 101 * find_bootmap_location - callback to find a memory area for the bootmap
 102 * @start: start of region
 103 * @end: end of region
 104 * @arg: unused callback data
 105 *
 106 * Find a place to put the bootmap and return its starting address in
 107 * bootmap_start.  This address must be page-aligned.
 108 */
 109static int __init
 110find_bootmap_location (unsigned long start, unsigned long end, void *arg)
 111{
 112        unsigned long needed = *(unsigned long *)arg;
 113        unsigned long range_start, range_end, free_start;
 114        int i;
 115
 116#if IGNORE_PFN0
 117        if (start == PAGE_OFFSET) {
 118                start += PAGE_SIZE;
 119                if (start >= end)
 120                        return 0;
 121        }
 122#endif
 123
 124        free_start = PAGE_OFFSET;
 125
 126        for (i = 0; i < num_rsvd_regions; i++) {
 127                range_start = max(start, free_start);
 128                range_end   = min(end, rsvd_region[i].start & PAGE_MASK);
 129
 130                free_start = PAGE_ALIGN(rsvd_region[i].end);
 131
 132                if (range_end <= range_start)
 133                        continue; /* skip over empty range */
 134
 135                if (range_end - range_start >= needed) {
 136                        bootmap_start = __pa(range_start);
 137                        return -1;      /* done */
 138                }
 139
 140                /* nothing more available in this segment */
 141                if (range_end == end)
 142                        return 0;
 143        }
 144        return 0;
 145}
 146
 147#ifdef CONFIG_SMP
 148static void *cpu_data;
 149/**
 150 * per_cpu_init - setup per-cpu variables
 151 *
 152 * Allocate and setup per-cpu data areas.
 153 */
 154void * __cpuinit
 155per_cpu_init (void)
 156{
 157        int cpu;
 158        static int first_time=1;
 159
 160        /*
 161         * get_free_pages() cannot be used before cpu_init() done.  BSP
 162         * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
 163         * get_zeroed_page().
 164         */
 165        if (first_time) {
 166                void *cpu0_data = __cpu0_per_cpu;
 167
 168                first_time=0;
 169
 170                __per_cpu_offset[0] = (char *) cpu0_data - __per_cpu_start;
 171                per_cpu(local_per_cpu_offset, 0) = __per_cpu_offset[0];
 172
 173                for (cpu = 1; cpu < NR_CPUS; cpu++) {
 174                        memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
 175                        __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
 176                        cpu_data += PERCPU_PAGE_SIZE;
 177                        per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
 178                }
 179        }
 180        return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
 181}
 182
 183static inline void
 184alloc_per_cpu_data(void)
 185{
 186        cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS-1,
 187                                   PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
 188}
 189#else
 190#define alloc_per_cpu_data() do { } while (0)
 191#endif /* CONFIG_SMP */
 192
 193/**
 194 * find_memory - setup memory map
 195 *
 196 * Walk the EFI memory map and find usable memory for the system, taking
 197 * into account reserved areas.
 198 */
 199void __init
 200find_memory (void)
 201{
 202        unsigned long bootmap_size;
 203
 204        reserve_memory();
 205
 206        /* first find highest page frame number */
 207        min_low_pfn = ~0UL;
 208        max_low_pfn = 0;
 209        efi_memmap_walk(find_max_min_low_pfn, NULL);
 210        max_pfn = max_low_pfn;
 211        /* how many bytes to cover all the pages */
 212        bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
 213
 214        /* look for a location to hold the bootmap */
 215        bootmap_start = ~0UL;
 216        efi_memmap_walk(find_bootmap_location, &bootmap_size);
 217        if (bootmap_start == ~0UL)
 218                panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
 219
 220        bootmap_size = init_bootmem_node(NODE_DATA(0),
 221                        (bootmap_start >> PAGE_SHIFT), 0, max_pfn);
 222
 223        /* Free all available memory, then mark bootmem-map as being in use. */
 224        efi_memmap_walk(filter_rsvd_memory, free_bootmem);
 225        reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT);
 226
 227        find_initrd();
 228
 229        alloc_per_cpu_data();
 230}
 231
 232static int
 233count_pages (u64 start, u64 end, void *arg)
 234{
 235        unsigned long *count = arg;
 236
 237        *count += (end - start) >> PAGE_SHIFT;
 238        return 0;
 239}
 240
 241/*
 242 * Set up the page tables.
 243 */
 244
 245void __init
 246paging_init (void)
 247{
 248        unsigned long max_dma;
 249        unsigned long max_zone_pfns[MAX_NR_ZONES];
 250
 251        num_physpages = 0;
 252        efi_memmap_walk(count_pages, &num_physpages);
 253
 254        memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 255#ifdef CONFIG_ZONE_DMA
 256        max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 257        max_zone_pfns[ZONE_DMA] = max_dma;
 258#endif
 259        max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 260
 261#ifdef CONFIG_VIRTUAL_MEM_MAP
 262        efi_memmap_walk(filter_memory, register_active_ranges);
 263        efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
 264        if (max_gap < LARGE_GAP) {
 265                vmem_map = (struct page *) 0;
 266                free_area_init_nodes(max_zone_pfns);
 267        } else {
 268                unsigned long map_size;
 269
 270                /* allocate virtual_mem_map */
 271
 272                map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
 273                        sizeof(struct page));
 274                vmalloc_end -= map_size;
 275                vmem_map = (struct page *) vmalloc_end;
 276                efi_memmap_walk(create_mem_map_page_table, NULL);
 277
 278                /*
 279                 * alloc_node_mem_map makes an adjustment for mem_map
 280                 * which isn't compatible with vmem_map.
 281                 */
 282                NODE_DATA(0)->node_mem_map = vmem_map +
 283                        find_min_pfn_with_active_regions();
 284                free_area_init_nodes(max_zone_pfns);
 285
 286                printk("Virtual mem_map starts at 0x%p\n", mem_map);
 287        }
 288#else /* !CONFIG_VIRTUAL_MEM_MAP */
 289        add_active_range(0, 0, max_low_pfn);
 290        free_area_init_nodes(max_zone_pfns);
 291#endif /* !CONFIG_VIRTUAL_MEM_MAP */
 292        zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
 293}
 294